/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.tomcat.jni;

/**
 * Stdlib
 *
 * @author Mladen Turk
 */
public class Stdlib {

	/**
	 * Read from plain memory
	 *
	 * @param dst Destination byte array
	 * @param src Source memory address
	 * @param sz  Number of bytes to copy.
	 */
	public static native boolean memread(byte[] dst, long src, int sz);

	/**
	 * Write to plain memory
	 *
	 * @param dst Destination memory address
	 * @param src Source byte array
	 * @param sz  Number of bytes to copy.
	 */
	public static native boolean memwrite(long dst, byte[] src, int sz);

	/**
	 * Sets buffers to a specified character
	 *
	 * @param dst Destination memory address
	 * @param c   Character to set.
	 * @param sz  Number of characters.
	 */
	public static native boolean memset(long dst, int c, int sz);

	/**
	 * Allocates memory blocks.
	 *
	 * @param sz Bytes to allocate.
	 */
	public static native long malloc(int sz);

	/**
	 * Reallocate memory blocks.
	 *
	 * @param mem Pointer to previously allocated memory block.
	 * @param sz  New size in bytes.
	 */
	public static native long realloc(long mem, int sz);

	/**
	 * Allocates an array in memory with elements initialized to 0.
	 *
	 * @param num Number of elements.
	 * @param sz  Length in bytes of each element.
	 */
	public static native long calloc(int num, int sz);

	/**
	 * Deallocates or frees a memory block.
	 *
	 * @param mem Previously allocated memory block to be freed.
	 */
	public static native void free(long mem);

	/**
	 * Get current process pid.
	 *
	 * @return current pid or &lt; 1 in case of error.
	 */
	public static native int getpid();

	/**
	 * Get current process parent pid.
	 *
	 * @return parent pid or &lt; 1 in case of error.
	 */
	public static native int getppid();

}
